.fileinco {
    background-repeat: no-repeat;
    border: 2px solid #fff;
    height: 92px;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
    width: 90px;
    margin-top: 8px;
    background-image: url("../images/gridIcon.png");
}
.txt_icon {background-position: -580px 17px;}
.doc_icon {background-position: -280px 17px;}
.docx_icon {background-position: -280px 17px;}
.ppt_icon {background-position: -380px 17px;}
.pdf_icon {background-position: -480px 17px;}
.rar_icon {background-position: 20px 17px;}
.zip_icon {background-position: -80px 17px;}
.xls_icon {background-position: -180px 17px;}
.xlsx_icon {background-position: -180px 17px;}

/**
音乐文件
*/
.mp3_icon {background-position: -680px 17px;}

.torrent_icon {background-position: -780px 17px;}
.default_icon {
    background: rgba(0, 0, 0, 0) url("../images/gridIcon_2.png") no-repeat scroll 28px 20px;
    height: 100px;
    margin-top: 8px;
    width: 100px;
}